How Hygienic Lobe Pumps Work...

A lobe pump is a rotary positive displacement pump. The operating principle is based on the counter-rotation of 2 rotors in a chamber, Both rotors are mounted on shafts. The shafts are supported by bearing cartridges, which are directly mounted to the pump casing. One of the shafts is externally driven, an internal gear transmission drives the other shaft in opposite direction. The rotors run synchronously in the opposite directions, without touching each other. When the rotors pass the suction port the volume between the rotors increases. This creates a pressure decrease which
causes the liquid to flow into the suction port. During rotation a fixed amount of liquid is conveyed and when the rotors approach the pressure port the volume between the rotors decreases, this creates a pressure increase which causes the liquid to flow out of the pressure port.